$(()=> {
  let $btn = $('input'),
      delay = 6,
      timer = null;
  
  $btn.val('同意（' + delay + 's）');
  $btn.attr('disabled', 'disabled');
  timer = setInterval(()=>{
    $btn.val('同意（' + --delay + 's）');
    if(delay === 0){
      clearInterval(timer);
      $btn.val('同意');
      $btn.removeAttr('disabled');
    }
  }, 1000);
  $btn.click(() => {
    alert('button click');
  })
});



